Import JSON file in Variable

Did you ever find an answer to this? There doesn’t seem to be any documentation. Here is what I have figured out so far…structure needs to be like this (these are the minimum properties necessary to not get that import error):
 

​​​​​​​{
  "gray-0": {
    "$type": "color",
    "$value": {
      "colorSpace": "srgb",
      "components": [1, 1, 1],
      "hex": "#FFFFFF"
    }
  },
  "gray-50": {
    "$type": "color",
    "$value": {
      "colorSpace": "srgb",
      "components": [0.9764706, 0.98039216, 0.9843137],
      "hex": "#F9FAFB"
    }
  }
}

If you’re doing something fancy like light/dark/other modes, each mode needs to be a separate file. For example Light.token.json and Dark.token.json and you select both files in the file dialogue when importing.​​​​​​​

You can also reference existing variables like this (below). Some oddities about this method - when imported, Figma correctly connects to the right variable via “targetVariableName” and “targetVariableSetName”; however, the hard-coded properties in “$value” still need to be included to avoid import errors.

{
  "text-primary": {
    "$type": "color",
    "$value": {
      "colorSpace": "srgb",
      "components": [
        0.06666667014360428,
        0.08627451211214066,
        0.12156862765550613
      ],
      "alpha": 1,
      "hex": "#11161F"
    },
    "$extensions": {
      "com.figma.aliasData": {
        "targetVariableName": "gray-900",
        "targetVariableSetName": "color"
      }
    }
  },
  "text-secondary": {
    "$type": "color",
    "$value": {
      "colorSpace": "srgb",
      "components": [
        0.21568627655506134,
        0.2549019753932953,
        0.3176470696926117
      ],
      "alpha": 1,
      "hex": "#374151"
    },
    "$extensions": {
      "com.figma.aliasData": {
        "targetVariableName": "gray-700",
        "targetVariableSetName": "color"
      }
    }
  }
}